Hello Megan:I also shoot with Canon and have acquired quite a collection of lenses, and have used, sold, bought, very many over the years, so I will answer in the best way I can to help you. You have quite a feat you are asking of one lens only. I would agree with all that it is not all possible with only one lens.
What is your main interest right now and what direction can you see yourself heading as for subject matter photography wise? This will have the main influence on what I would ever recommend for a lens as of this moment. Also, what are you talking as in budget, as this will give us a good idea on what is available towards a decision.The 70-300 that you are shooting right now is an excellent lens as long as you shoot around f8-f11, as that is its sweet spot for sure. I am talking from past experience with that exact lens .
You DO NOT want to cheap out on lenses if you see yourself getting into this more seriously in the future. The lenses are an investment, as they will last a very long time if taken care of, and they keep their value very well as compared to bodies.
There are a lot of years of experience on this forum, along with loads of good people. So feel free to pick everyones brains on any subject you like and I am sure you will find the answer you are looking for.
As for the Kata bag, we have one, and it is also the 30 which I would HIGHLY recommend. You might as well buy the biggest one now as you will be buying it later anyways. This bag is light, comfortable, and tough. We hike quite a bit with our gear and this bag is amazing for sure.
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